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Spectral Response of Photochromic Glass at High Excitation Intensity
Author(s) -
Kivlighn H. D.,
Reichman J.,
Casagrande L.
Publication year - 1982
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1982.tb10459.x
Subject(s) - photochromism , excitation , absorption (acoustics) , radiation , wavelength , materials science , penetration depth , radiant intensity , chemistry , optics , analytical chemistry (journal) , optoelectronics , photochemistry , physics , composite material , chromatography , quantum mechanics
A conventional photochromic glass, heat‐treated at 570°C for 20 h, was evaluated for its darkening kinetics for selected absorption wavelength intervals between 600 and 1000 nm. Excitation levels of 25, 45, and 90 mW/cm 2 were used. Equilibrium absorption coefficients were measured as a function of depth of penetration of the excitation radiation and were fitted to an exponential function used to calculate related surface absorption coefficients. Optical bleaching radiation present in the excitation source, as well as the transverse monitoring beam, probably contribute to lower than intrinsic absorption characteristics.